That is an interesting look. At first I thought florescent paints on the one you linked to at the top, but looking at the others they do show signs suggesting out of focus projector lens artifacts. (The regular pattern of curved dark lines at the edges. I find they tend to be most visible on old school over head projectors, the ones using the big clear sheets in classrooms.)
However, the textures on some really look like body paint, so it wouldn't surprise me if there were a nice mix of methods used in there.
Might have to try playing with this myself sometime. (Should probably find examples that aren't nude. I figure showing off those as examples to some of my friends is a great way to get hit or slapped.)
Canon EOS 7D | EF 28 f/1.8 | EF 85 f/1.8 | EF 70-200 f/4L | EF-S 17-55 | Sigma 150-500